My ex-MIL remained not only friendly with, but remained business partners with, her ex-husband for YEARS. She and her BF of over 20 years go to events hosted by her ex's family, and her ex's family is welcome at her events as well.

It's not unheard of among mono folks.

__________________Dramatis personae:Me: 47/F, Monogamish? Divorced with 2 kids, 2 cats, a tarantula, and a 1930s house with many projects.Chops: 48/M, Partner of 7 years.Spinner: 53/M, Friend I went on a couple dates with. Divorced, Mono, "just friends".Xena: 48/F, Chops' partner of 7 yearsCurls: 51/F, Chops' partner of 2 years